module MuxCuatro(
input [1:0] AluSrcB, // seleccion
input [31:0] InCero,
input [31:0] InUno,
input [31:0] InDos,
input [31:0] InTres,
output reg [31:0] Out2Alu
);



always @ (*) 
  begin
    case (AluSrcB)
      0: Out2Alu = InCero;
      1: Out2Alu = InUno;
      2: Out2Alu = InDos;
      3: Out2Alu = InTres;
      default:
       Out2Alu = InCero;
    endcase
  end
endmodule